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0fa91a0a | 1 | /* |
2 | * $Source$ | |
3 | * $Author$ | |
4 | * $Header$ | |
5 | * | |
6 | * Copyright (C) 1987 by the Massachusetts Institute of Technology | |
c801de4c | 7 | * For copying and distribution information, please see the file |
8 | * <mit-copyright.h>. | |
0fa91a0a | 9 | * |
10 | * SMS server process. | |
11 | * | |
12 | * Most of this is stolen from ../gdb/tsr.c | |
13 | * | |
14 | * You are in a maze of twisty little finite automata, all different. | |
15 | * Let the reader beware. | |
16 | * | |
0fa91a0a | 17 | */ |
18 | ||
0fa91a0a | 19 | static char *rcsid_sms_main_c = "$Header$"; |
0fa91a0a | 20 | |
c801de4c | 21 | #include <mit-copyright.h> |
70d54e43 | 22 | #include <strings.h> |
23 | #include <sys/errno.h> | |
70d54e43 | 24 | #include <sys/signal.h> |
554776b1 | 25 | #include <sys/wait.h> |
0fa91a0a | 26 | #include "sms_server.h" |
70d54e43 | 27 | |
0ec57336 | 28 | extern CONNECTION newconn, listencon; |
0fa91a0a | 29 | |
0ec57336 | 30 | extern int nclients; |
31 | extern client **clients, *cur_client; | |
0fa91a0a | 32 | |
0ec57336 | 33 | extern OPERATION listenop; |
34 | extern LIST_OF_OPERATIONS op_list; | |
0fa91a0a | 35 | |
0ec57336 | 36 | extern struct sockaddr_in client_addr; |
37 | extern int client_addrlen; | |
38 | extern TUPLE client_tuple; | |
0fa91a0a | 39 | |
0ec57336 | 40 | extern char *whoami; |
41 | extern char buf1[BUFSIZ]; | |
42 | extern char *takedown; | |
43 | extern int errno; | |
2f4ff9cd | 44 | extern FILE *journal; |
45 | #define JOURNAL "/u1/sms/journal" | |
70d54e43 | 46 | |
0ec57336 | 47 | extern char *malloc(); |
f5c72293 | 48 | extern int free(); |
0ec57336 | 49 | extern char *inet_ntoa(); |
50 | extern void sms_com_err(); | |
51 | extern void do_client(); | |
70d54e43 | 52 | |
0ec57336 | 53 | extern int sigshut(); |
54 | void clist_append(); | |
55 | void oplist_append(); | |
554776b1 | 56 | void reapchild(); |
0fa91a0a | 57 | |
0eb9f52f | 58 | extern time_t now; |
59 | ||
0ec57336 | 60 | /* |
61 | * Main SMS server loop. | |
62 | * | |
63 | * Initialize the world, then start accepting connections and | |
64 | * making progress on current connections. | |
65 | */ | |
0fa91a0a | 66 | |
0ec57336 | 67 | /*ARGSUSED*/ |
68 | int | |
0fa91a0a | 69 | main(argc, argv) |
70d54e43 | 70 | int argc; |
71 | char **argv; | |
0fa91a0a | 72 | { |
0ec57336 | 73 | int status; |
0eb9f52f | 74 | time_t tardy; |
0ec57336 | 75 | |
76 | whoami = argv[0]; | |
77 | /* | |
78 | * Error handler init. | |
79 | */ | |
80 | init_sms_err_tbl(); | |
81 | init_krb_err_tbl(); | |
82 | set_com_err_hook(sms_com_err); | |
b4182127 | 83 | setlinebuf(stderr); |
84 | ||
0ec57336 | 85 | if (argc != 1) { |
86 | com_err(whoami, 0, "Usage: smsd"); | |
87 | exit(1); | |
88 | } | |
f5c72293 | 89 | |
90 | /* Profiling implies that getting rid of one level of call | |
91 | * indirection here wins us maybe 1% on the VAX. | |
92 | */ | |
93 | gdb_amv = malloc; | |
94 | gdb_fmv = free; | |
0ec57336 | 95 | |
96 | /* | |
97 | * GDB initialization. | |
98 | */ | |
5dbd09a0 | 99 | if(gdb_init() != 0) { |
100 | com_err(whoami, 0, "GDB initialization failed."); | |
101 | exit(1); | |
102 | } | |
7f024a70 | 103 | gdb_debug(0); /* this can be patched, if necessary, to enable */ |
104 | /* GDB level debugging .. */ | |
4a06eb54 | 105 | krb_realm = malloc(REALM_SZ); |
106 | get_krbrlm(krb_realm, 1); | |
7f024a70 | 107 | |
f6cc38de | 108 | /* |
109 | * Database initialization. | |
110 | */ | |
111 | ||
112 | if ((status = sms_open_database()) != 0) { | |
2f4ff9cd | 113 | com_err(whoami, status, " when trying to open database."); |
f6cc38de | 114 | exit(1); |
115 | } | |
116 | ||
2f4ff9cd | 117 | sanity_check_queries(); |
118 | sanity_check_database(); | |
119 | ||
0ec57336 | 120 | /* |
121 | * Set up client array handler. | |
122 | */ | |
0fa91a0a | 123 | nclients = 0; |
124 | clients = (client **) malloc(0); | |
70d54e43 | 125 | |
0ec57336 | 126 | /* |
127 | * Signal handlers | |
f6cc38de | 128 | * There should probably be a few more of these. |
0ec57336 | 129 | */ |
70d54e43 | 130 | |
0ec57336 | 131 | if ((((int)signal (SIGTERM, sigshut)) < 0) || |
ce81c728 | 132 | (((int)signal (SIGCHLD, reapchild)) < 0) || |
0ec57336 | 133 | (((int)signal (SIGHUP, sigshut)) < 0)) { |
2f4ff9cd | 134 | com_err(whoami, errno, " Unable to establish signal handler."); |
0ec57336 | 135 | exit(1); |
136 | } | |
137 | ||
2f4ff9cd | 138 | journal = fopen(JOURNAL, "a"); |
139 | if (journal == NULL) { | |
140 | com_err(whoami, errno, " while opening journal file"); | |
141 | exit(1); | |
142 | } | |
143 | ||
0ec57336 | 144 | /* |
145 | * Establish template connection. | |
146 | */ | |
147 | if ((status = do_listen()) != 0) { | |
148 | com_err(whoami, status, | |
2f4ff9cd | 149 | " while trying to create listening connection"); |
0ec57336 | 150 | exit(1); |
151 | } | |
0fa91a0a | 152 | |
0fa91a0a | 153 | op_list = create_list_of_operations(1, listenop); |
0fa91a0a | 154 | |
b4182127 | 155 | com_err(whoami, 0, "started (pid %d)", getpid()); |
0ec57336 | 156 | com_err(whoami, 0, rcsid_sms_main_c); |
49700f8b | 157 | send_zgram("SMS", "server started"); |
0ec57336 | 158 | |
159 | /* | |
160 | * Run until shut down. | |
161 | */ | |
70d54e43 | 162 | while(!takedown) { |
0ec57336 | 163 | register int i; |
164 | /* | |
165 | * Block until something happens. | |
166 | */ | |
5dbd09a0 | 167 | #ifdef notdef |
168 | com_err(whoami, 0, "tick"); | |
169 | #endif notdef | |
170 | errno = 0; | |
171 | status = op_select_any(op_list, 0, | |
172 | (fd_set *)NULL, (fd_set *)NULL, | |
173 | (fd_set *)NULL, (struct timeval *)NULL); | |
174 | ||
175 | if (status == -1) { | |
2f4ff9cd | 176 | com_err(whoami, errno, " error from op_select"); |
5dbd09a0 | 177 | continue; |
178 | } else if (status != -2) { | |
2f4ff9cd | 179 | com_err(whoami, 0, " wrong return from op_select_any"); |
5dbd09a0 | 180 | continue; |
181 | } | |
70d54e43 | 182 | if (takedown) break; |
0eb9f52f | 183 | time(&now); |
70d54e43 | 184 | #ifdef notdef |
185 | fprintf(stderr, " tick\n"); | |
186 | #endif notdef | |
b4182127 | 187 | /* |
188 | * Handle any new connections; this comes first so | |
189 | * errno isn't tromped on. | |
190 | */ | |
191 | if (OP_DONE(listenop)) { | |
192 | if (OP_STATUS(listenop) == OP_CANCELLED) { | |
193 | if (errno == EWOULDBLOCK) { | |
194 | do_reset_listen(); | |
195 | } else { | |
196 | com_err(whoami, errno, | |
2f4ff9cd | 197 | " error on listen"); |
b4182127 | 198 | exit(1); |
199 | } | |
200 | } else if ((status = new_connection()) != 0) { | |
201 | com_err(whoami, errno, | |
2f4ff9cd | 202 | " Error on listening operation."); |
b4182127 | 203 | /* |
204 | * Sleep here to prevent hosing? | |
205 | */ | |
206 | } | |
207 | } | |
0ec57336 | 208 | /* |
209 | * Handle any existing connections. | |
210 | */ | |
0eb9f52f | 211 | tardy = now - 30*60; |
212 | ||
0fa91a0a | 213 | for (i=0; i<nclients; i++) { |
0eb9f52f | 214 | cur_client = clients[i]; |
0fa91a0a | 215 | if (OP_DONE(clients[i]->pending_op)) { |
0eb9f52f | 216 | cur_client->last_time_used = now; |
70d54e43 | 217 | do_client(cur_client); |
0eb9f52f | 218 | } else if (clients[i]->last_time_used < tardy) { |
219 | com_err(whoami, 0, "Shutting down connection due to inactivity"); | |
220 | shutdown(cur_client->con->in.fd, 0); | |
0fa91a0a | 221 | } |
0eb9f52f | 222 | cur_client = NULL; |
223 | if (takedown) break; | |
0fa91a0a | 224 | } |
0fa91a0a | 225 | } |
b4182127 | 226 | com_err(whoami, 0, "%s", takedown); |
f6cc38de | 227 | sms_close_database(); |
49700f8b | 228 | send_zgram("SMS", takedown); |
0ec57336 | 229 | return 0; |
70d54e43 | 230 | } |
231 | ||
0ec57336 | 232 | /* |
233 | * Set up the template connection and queue the first accept. | |
234 | */ | |
235 | ||
236 | int | |
237 | do_listen() | |
70d54e43 | 238 | { |
0ec57336 | 239 | char *service = index(SMS_GDB_SERV, ':') + 1; |
240 | ||
241 | listencon = create_listening_connection(service); | |
242 | ||
243 | if (listencon == NULL) | |
244 | return errno; | |
245 | ||
246 | listenop = create_operation(); | |
247 | client_addrlen = sizeof(client_addr); | |
248 | ||
249 | start_accepting_client(listencon, listenop, &newconn, | |
250 | (char *)&client_addr, | |
251 | &client_addrlen, &client_tuple); | |
252 | return 0; | |
0fa91a0a | 253 | } |
254 | ||
b4182127 | 255 | |
256 | do_reset_listen() | |
257 | { | |
258 | client_addrlen = sizeof(client_addr); | |
259 | start_accepting_client(listencon, listenop, &newconn, | |
260 | (char *)&client_addr, | |
261 | &client_addrlen, &client_tuple); | |
262 | } | |
263 | ||
0ec57336 | 264 | /* |
265 | * This routine is called when a new connection comes in. | |
266 | * | |
267 | * It sets up a new client and adds it to the list of currently active clients. | |
268 | */ | |
269 | int | |
5dbd09a0 | 270 | new_connection() |
0fa91a0a | 271 | { |
7f024a70 | 272 | register client *cp; |
70d54e43 | 273 | static counter = 0; |
0fa91a0a | 274 | |
0fa91a0a | 275 | /* |
276 | * Make sure there's been no error | |
277 | */ | |
c27b3454 | 278 | if(OP_STATUS(listenop) != OP_COMPLETE) { |
0ec57336 | 279 | return errno; |
c27b3454 | 280 | } |
281 | ||
282 | if (newconn == NULL) { | |
283 | return SMS_NOT_CONNECTED; | |
0fa91a0a | 284 | } |
285 | ||
0fa91a0a | 286 | /* |
287 | * Set up the new connection and reply to the client | |
288 | */ | |
7f024a70 | 289 | cp = (client *)malloc(sizeof *cp); |
23e476e8 | 290 | bzero(cp, sizeof(*cp)); |
0fa91a0a | 291 | cp->state = CL_STARTING; |
292 | cp->action = CL_ACCEPT; | |
293 | cp->con = newconn; | |
70d54e43 | 294 | cp->id = counter++; |
0ec57336 | 295 | cp->args = NULL; |
296 | cp->clname = NULL; | |
297 | cp->reply.sms_argv = NULL; | |
4a06eb54 | 298 | cp->first = NULL; |
299 | cp->last = NULL; | |
0eb9f52f | 300 | cp->last_time_used = now; |
0fa91a0a | 301 | newconn = NULL; |
302 | ||
303 | cp->pending_op = create_operation(); | |
304 | reset_operation(cp->pending_op); | |
305 | oplist_append(&op_list, cp->pending_op); | |
70d54e43 | 306 | cur_client = cp; |
307 | ||
0ec57336 | 308 | /* |
309 | * Add a new client to the array.. | |
310 | */ | |
311 | clist_append(cp); | |
312 | ||
313 | /* | |
314 | * Let him know we heard him. | |
315 | */ | |
0fa91a0a | 316 | start_replying_to_client(cp->pending_op, cp->con, GDB_ACCEPTED, |
317 | "", ""); | |
0ec57336 | 318 | |
319 | cp->haddr = client_addr; | |
320 | ||
321 | /* | |
322 | * Log new connection. | |
323 | */ | |
324 | ||
b4182127 | 325 | com_err(whoami, 0, "New connection from %s port %d (now %d client%s)", |
326 | inet_ntoa(cp->haddr.sin_addr), | |
327 | (int)ntohs(cp->haddr.sin_port), | |
328 | nclients, | |
329 | nclients!=1?"s":""); | |
0fa91a0a | 330 | |
331 | /* | |
0ec57336 | 332 | * Get ready to accept the next connection. |
0fa91a0a | 333 | */ |
334 | reset_operation(listenop); | |
0ec57336 | 335 | client_addrlen = sizeof(client_addr); |
0fa91a0a | 336 | |
337 | start_accepting_client(listencon, listenop, &newconn, | |
0ec57336 | 338 | (char *)&client_addr, |
339 | &client_addrlen, &client_tuple); | |
340 | return 0; | |
0fa91a0a | 341 | } |
342 | ||
0fa91a0a | 343 | /* |
344 | * Add a new client to the known clients. | |
345 | */ | |
0ec57336 | 346 | void |
0fa91a0a | 347 | clist_append(cp) |
348 | client *cp; | |
349 | { | |
350 | client **clients_n; | |
351 | ||
352 | nclients++; | |
0ec57336 | 353 | clients_n = (client **)malloc |
354 | ((unsigned)(nclients * sizeof(client *))); | |
0fa91a0a | 355 | bcopy((char *)clients, (char *)clients_n, (nclients-1)*sizeof(cp)); |
356 | clients_n[nclients-1] = cp; | |
357 | free((char *)clients); | |
358 | clients = clients_n; | |
359 | clients_n = NULL; | |
360 | } | |
361 | ||
70d54e43 | 362 | |
0ec57336 | 363 | void |
70d54e43 | 364 | clist_delete(cp) |
365 | client *cp; | |
366 | { | |
70d54e43 | 367 | client **clients_n, **scpp, **dcpp; /* source and dest client */ |
368 | /* ptr ptr */ | |
369 | ||
70d54e43 | 370 | int found_it = 0; |
371 | ||
0ec57336 | 372 | clients_n = (client **)malloc |
373 | ((unsigned)((nclients - 1)* sizeof(client *))); | |
70d54e43 | 374 | for (scpp = clients, dcpp = clients_n; scpp < clients+nclients; ) { |
375 | if (*scpp != cp) { | |
376 | *dcpp++ = *scpp++; | |
377 | } else { | |
378 | scpp++; | |
379 | if (found_it) abort(); | |
380 | found_it = 1; | |
381 | } | |
382 | } | |
383 | --nclients; | |
384 | free((char *)clients); | |
385 | clients = clients_n; | |
386 | clients_n = NULL; | |
c27b3454 | 387 | oplist_delete(op_list, cp->pending_op); |
70d54e43 | 388 | reset_operation(cp->pending_op); |
389 | delete_operation(cp->pending_op); | |
7f024a70 | 390 | sever_connection(cp->con); |
0ec57336 | 391 | free((char *)cp); |
70d54e43 | 392 | } |
0ec57336 | 393 | |
0fa91a0a | 394 | /* |
0ec57336 | 395 | * Add a new operation to a list of operations. |
396 | * | |
397 | * This should be rewritten to use realloc instead, since in most | |
398 | * cases it won't have to copy the array. | |
0fa91a0a | 399 | */ |
400 | ||
0ec57336 | 401 | void |
0fa91a0a | 402 | oplist_append(oplp, op) |
403 | LIST_OF_OPERATIONS *oplp; | |
404 | OPERATION op; | |
405 | { | |
406 | int count = (*oplp)->count+1; | |
407 | LIST_OF_OPERATIONS newlist = (LIST_OF_OPERATIONS) | |
408 | db_alloc(size_of_list_of_operations(count)); | |
409 | bcopy((char *)(*oplp), (char *)newlist, | |
410 | size_of_list_of_operations((*oplp)->count)); | |
0fa91a0a | 411 | newlist->count++; |
412 | newlist->op[count-1] = op; | |
467f5982 | 413 | db_free((char *)(*oplp), size_of_list_of_operations(count-1)); |
0fa91a0a | 414 | (*oplp) = newlist; |
415 | } | |
416 | ||
c27b3454 | 417 | |
418 | oplist_delete(oplp, op) | |
419 | LIST_OF_OPERATIONS oplp; | |
420 | register OPERATION op; | |
421 | { | |
422 | register OPERATION *s; | |
423 | register int c; | |
424 | ||
425 | for (s = oplp->op, c=oplp->count; c; --c, ++s) { | |
426 | if (*s == op) { | |
427 | while (c > 0) { | |
428 | *s = *(s+1); | |
429 | ++s; | |
430 | --c; | |
431 | } | |
432 | oplp->count--; | |
433 | return; | |
434 | } | |
435 | } | |
436 | abort(); | |
437 | } | |
554776b1 | 438 | |
439 | ||
440 | void reapchild() | |
441 | { | |
442 | union wait status; | |
443 | int pid; | |
444 | ||
445 | while ((pid = wait3(&status, WNOHANG, (struct rusage *)0)) > 0) { | |
446 | if (status.w_termsig == 0 && status.w_retcode == 0) | |
447 | com_err(whoami, 0, "dcm started successfully"); | |
448 | else | |
449 | com_err(whoami, 0, "%d: startdcm exits with signal %d status %d", | |
450 | pid, status.w_termsig, status.w_retcode); | |
451 | } | |
452 | } |